https://ukandeu.ac.uk/trade-migration-and-brexit/
http://www.euronews.com/2017/09/19/portugal-in-cash-for-passports-scandal?utm_source=newsletter&utm_medium=en&utm_content=portugal-in-cash-for-passports-scandal&_ope=eyJndWlkIjoiZjU3Y2JhYmUwMGUxZDFiNTUxOTU1ZDljNzExNTI1MmEifQ==
http://carnegieeurope.eu/2017/06/15/bringing-brexit-back-to-reality-pub-71262
http://institute.global/sites/default/files/field_article_attached_file/IGC_EU%20Migration_10.09.17.pdf